CODEWITHSUNDEEP
groovygremlintinkerpop3
Joey Baruch
Joey Baruch

Reputation: 5249

What import do i need for inV() and hasID() in gremlin groovy (3.0.1-incubating)

I'm trying to get a property value of an edge given source and dest vertex ids, and edge label.

in the gremlin terminal the following worked:

g.V("fromNodeId").outE("edgeLabel").where(inV().hasID("toNodeID")).values("edgeProp")

sadly, in groovy, the inV() and hasID() aren't recognized, and i can't find the correct import to get it to work.

here are the imports iv'e tried:

import org.apache.commons.configuration.Configuration;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource
import org.apache.tinkerpop.gremlin.process.*
import org.apache.tinkerpop.gremlin.groovy.*
import org.apache.tinkerpop.gremlin.groovy.function.*
import org.apache.tinkerpop.gremlin.groovy.util.*
import org.apache.tinkerpop.gremlin.pipes.filter.*
import org.apache.tinkerpop.gremlin.structure.Edge
import org.apache.tinkerpop.gremlin.structure.Vertex
import org.apache.tinkerpop.gremlin.structure.EdgeTest;
import org.apache.tinkerpop.gremlin.structure.Graph

i'll note that other queries s.a. the following work just fine:

String getPropValueByID(Long id, String prop){
    def result = []
    **g.V(id).values(prop).fill(result)**
    if(result.empty) return null

    return result.first()
}

Upvotes: 0

Views: 474

Answers (1)

Jason Plurad
Jason Plurad

Reputation: 6792

This is described in the TinkerPop3 documentation

To reduce the verbosity of the expression, it is good to import static org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.*. This way, instead of doing __.inE() for an anonymous traversal, it is possible to simply write inE(). Be aware of language-specific reserved keywords when using anonymous traversals. For example, in and as are reserved keywords in Groovy, therefore you must use the verbose syntax __.in() and __.as() to avoid collisions.

Upvotes: 2

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